A 15 foot ladder is learning against a house so that it is 7 feet from the ground. What angle does the ladder make with the ground?
Make you sketch, and you are given the hypotenuse and the adjacent.
If you know your trig ratios, the trig ratio that involves hypotenuse and adjacent is the cosine.
cos Ø = 7/15
Ø = .....
let me know what you get